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- W4283777125 abstract "The pancreatic ductal adenocarcinoma (PDAC) has a bad prognosis with delayed diagnosis that significantly impedes the use of therapeutic resection. Similarly, colorectal cancer (CRC) is often diagnosed at an advanced stage when tumor cell dissemination has taken place in the liver. A main reason for this situation is the already resistant or newly resistant tumors to all conventional current therapies. Here, we report the re-sensitization of PDAC and CRC cells to chemotherapy, radiotherapy and/or immune checkpoint inhibitors by the newly developed inhibitors that target the activity of the proprotein convertases, enzymes involved in the biological activation/maturation of various protein precursors crucial for the malignant phenotype of PDAC and CRC tumors. The in vitro studies include T-cell activation assay performed with plate-bound anti-CD3, qRT-PCR assay and immunocytochemistry for the analysis of the proprotein convertases expression in human cells and tissues. Flow cytometry analysis was performed on single cell suspension of hPBMCs and T cells to analyze PD-1 expression. The activity of the proprotein convertase was assessed by the evaluation of the enzymes' ability to digest the universal PC substrate, the fluorogenic peptide pERTKR-MCA. The analysis of the seven known PC family members, namely, Furin, PC1, PC2, PC4, PACE4, PC5 and PC7, revealed their presence with predominant expression of Furin in PDAC and CRC tissues while compared to non-cancerous tissues from the same patients that associated alteration of the epithelial structure with highly spread expression of Furin all over the tumors. Using computer-aided virtual screening and repurposing approved drug strategies we identify small molecules and repurpose approved drugs against Furin, the only convertase with published crystallographic structure. We generated a collection of 2082 small molecules with 15 molecules identified having an inhibitory Furin activity. Using human cancer organoids in the presence of some of these molecules, the latter were more sensitive to radiotherapy, Gemcitabine and/or 5-fluorouracil. Treatment of activated T cells or PBMCs with these inhibitors repressed significantly PD-1 expression. In preclinical studies using syngeneic mice, 5 molecules were found to significantly reduce tumor progression that associated enhanced survival and sensitivity to radiotherapy of the tumor cells-inoculated mice. The tumor regression was associated with enhanced T cells infiltration in the developed tumors. These findings suggest the potential efficacy of Furin inhibitors in the sensitization of pancreatic and metastatic colon tumors to drug resistance that may contribute to the development of efficient therapeutic strategies and to improve the prognosis of patients with these cancers." @default.
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- W4283777125 date "2022-06-01" @default.
- W4283777125 modified "2023-09-29" @default.
- W4283777125 title "P-147 Sensitization of pancreatic and colorectal cancer to radiotherapy, chemotherapy, and immune checkpoint inhibitors by newly developed proprotein convertase inhibitors" @default.
- W4283777125 doi "https://doi.org/10.1016/j.annonc.2022.04.237" @default.
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